<!doctype html>
<html lang="en">
	<head>
		<meta charset="UTF-8">
		<title>three</title>
	</head>
	<body>
		
		这是第三个页面
		<input id='prev' type="button"  value='<'/>

		<script type="text/javascript">
			prev.onclick = function(){
				//history.back();
				history.go(-1);
			}
			
		</script>
	</body>
</html>
